BibTex format
@article{Gregson:2002:10.1097/00002030-200203080-00017,
author = {Gregson, S and Terceira, N and Kakowa, M and Mason, PR and Anderson, RA and Chandiwana, SK and Caraël, M},
doi = {10.1097/00002030-200203080-00017},
journal = {AIDS},
pages = {643--652},
title = {Study of bias in antenatal clinic HIV-1 surveillance data in a high contraceptive prevalence population in sub-Saharan Africa},
url = {http://dx.doi.org/10.1097/00002030-200203080-00017},
volume = {16},
year = {2002}
}